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Ventilation Processes in a Three-Dimensional Street Canyon
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SYSNO ASEP 0458864 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Ventilation Processes in a Three-Dimensional Street Canyon Author(s) Nosek, Štěpán (UT-L) RID, ORCID
Kukačka, L. (CZ)
Kellnerová, Radka (UT-L) RID, ORCID
Jurčáková, Klára (UT-L) RID, ORCID
Jaňour, Zbyněk (UT-L) RID, ORCIDSource Title Boundary Layer Meteorology - ISSN 0006-8314
Roč. 159, č. 2 (2016), s. 259-284Number of pages 26 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords Coherent structures ; line source ; pollution flux measurements ; street canyon ; wind tunnel Subject RIV BK - Fluid Dynamics R&D Projects GAP101/12/1554 GA ČR - Czech Science Foundation (CSF) GA15-18964S GA ČR - Czech Science Foundation (CSF) Institutional support UT-L - RVO:61388998 UT WOS 000374666100005 EID SCOPUS 84957027027 DOI 10.1007/s10546-016-0132-2 Annotation The ventilation processes in three different street canyons of variable roof geometry were investigated in a wind tunnel using a ground-level line source. A constant roof height was used in the first case, while a variable roof height along the leeward or windward walls was simulated in the two other cases. All street-canyon models were exposed to a neutrally stratified flow with two approaching wind directions, perpendicular and oblique. The relative pollutant removals and spatially-averaged concentrations within the canyons revealed that the model with constant roof height has higher re-emissions than models with variable roof heights. The nomenclature for the ventilation processes according to quadrant analysis of the pollutant flux was introduced. The venting of polluted air increased when the wind direction changed from perpendicular to oblique, irrespective of the studied canyon model. Strong correlations (>0.5) between coherent structures and ventilation processes were found at roof level, irrespective of the canyon model and wind direction. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2017
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